# Unigine::SystemLogic Class (CPP)

**Header:** #include <UnigineLogic.h>


The *SystemLogic* class is used to control the logic of the application. Methods of this class are called after corresponding methods of the system script.


## SystemLogic Class

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## virtual int init ( )

Engine calls this function on engine initialization. Similar to the system script's *init()* function.
### Return value

Returns true if there were no errors; otherwise, false.
## virtual int shutdown ( )

Engine calls this function on engine shutdown. Similar to the system script's *shutdown()* function.
### Return value

Returns true if there were no errors; otherwise, false.
## virtual int update ( )

Engine calls this function before updating each render frame. Similar to the system script's *update()* function.
### Return value

Returns true if there were no errors; otherwise, false.
## virtual int postUpdate ( )

Engine calls this function before rendering each render frame. Similar to the system script's *postUpdate()* function.
### Return value

Returns true if there were no errors; otherwise, false.